I didn't mean to be so negative in my reply
Certainly it can be done; the suggestions so far have been pretty good.
A photographer in our town makes a very good (second) living by shooting only local sports teams. (Little league, Cinderella Softball, Pop Warner football, etc.)
She contracts with parents to shoot a sports portfolio of their child in action; and makes a pretty penny doing it. I think something drawn on that model might be a winner. Someone with a million dollar boat might easily spend a couple of grand on some custom photography, esp. if you can do high quality video.
You'd need a fast chase boat, some good
cameras, and a great marketing plan.